The benefits of getting fish in your diet are well known (it's in the Mediterranean diet, for example), but mercury poisoning ...

A 3.5-ounce (100-gram) serving of canned light tuna contains 269 IU of vitamin D, which is 34% of the DV. However, tuna also contains mercury, a heavy metal found in many types of fish.

Seafood lovers know the fatty marbling is what makes tuna sashimi and sushi so tasty, so for the industry, it’s the fish’s ...